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tracing: Remove check_arg() callbacks from dynevent args

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It's kind of strange to have check_arg() callbacks as part of the arg
objects themselves; it makes more sense to just pass these in when the
args are added instead.

Remove the check_arg() callbacks from those objects which also means
removing the check_arg() args from the init functions, adding them to
the add functions and fixing up existing callers.

Link: http://lkml.kernel.org/r/c7708d6f177fcbe1a36b6e4e8e150907df0fa5d2.1580506712.git.zanussi@kernel.org

Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Tom Zanussi 2020-01-31 15:55:32 -06:00 committed by Steven Rostedt (VMware)
parent 249d7b2ef6
commit 74403b6c50
4 changed files with 46 additions and 53 deletions
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62
kernel/trace/trace_dynevent.c
View File

@ -228,27 +228,30 @@ fs_initcall(init_dynamic_event);
* dynevent_arg_add - Add an arg to a dynevent_cmd
* @cmd: A pointer to the dynevent_cmd struct representing the new event cmd
* @arg: The argument to append to the current cmd
* @check_arg: An (optional) pointer to a function checking arg sanity
*
* Append an argument to a dynevent_cmd. The argument string will be
* appended to the current cmd string, followed by a separator, if
* applicable. Before the argument is added, the check_arg()
* function, if defined, is called.
* applicable. Before the argument is added, the @check_arg function,
* if present, will be used to check the sanity of the current arg
* string.
*
* The cmd string, separator, and check_arg() function should be set
* using the dynevent_arg_init() before any arguments are added using
* this function.
* The cmd string and separator should be set using the
* dynevent_arg_init() before any arguments are added using this
* function.
*
* Return: 0 if successful, error otherwise.
*/
int dynevent_arg_add(struct dynevent_cmd *cmd,
struct dynevent_arg *arg)
struct dynevent_arg *arg,
dynevent_check_arg_fn_t check_arg)
{
int ret = 0;
int delta;
char *q;
if (arg->check_arg) {
ret = arg->check_arg(arg);
if (check_arg) {
ret = check_arg(arg);
if (ret)
return ret;
}
@ -269,6 +272,7 @@ int dynevent_arg_add(struct dynevent_cmd *cmd,
* dynevent_arg_pair_add - Add an arg pair to a dynevent_cmd
* @cmd: A pointer to the dynevent_cmd struct representing the new event cmd
* @arg_pair: The argument pair to append to the current cmd
* @check_arg: An (optional) pointer to a function checking arg sanity
*
* Append an argument pair to a dynevent_cmd. An argument pair
* consists of a left-hand-side argument and a right-hand-side
@ -278,24 +282,26 @@ int dynevent_arg_add(struct dynevent_cmd *cmd,
*
* The lhs argument string will be appended to the current cmd string,
* followed by an operator, if applicable, followd by the rhs string,
* followed finally by a separator, if applicable. Before anything is
* added, the check_arg() function, if defined, is called.
* followed finally by a separator, if applicable. Before the
* argument is added, the @check_arg function, if present, will be
* used to check the sanity of the current arg strings.
*
* The cmd strings, operator, separator, and check_arg() function
* should be set using the dynevent_arg_pair_init() before any arguments
* are added using this function.
* The cmd strings, operator, and separator should be set using the
* dynevent_arg_pair_init() before any arguments are added using this
* function.
*
* Return: 0 if successful, error otherwise.
*/
int dynevent_arg_pair_add(struct dynevent_cmd *cmd,
struct dynevent_arg_pair *arg_pair)
struct dynevent_arg_pair *arg_pair,
dynevent_check_arg_fn_t check_arg)
{
int ret = 0;
int delta;
char *q;
if (arg_pair->check_arg) {
ret = arg_pair->check_arg(arg_pair);
if (check_arg) {
ret = check_arg(arg_pair);
if (ret)
return ret;
}
@ -385,20 +391,16 @@ void dynevent_cmd_init(struct dynevent_cmd *cmd, char *buf, int maxlen,
/**
* dynevent_arg_init - Initialize a dynevent_arg object
* @arg: A pointer to the dynevent_arg struct representing the arg
* @check_arg: An (optional) pointer to a function checking arg sanity
* @separator: An (optional) separator, appended after adding the arg
*
* Initialize a dynevent_arg object. A dynevent_arg represents an
* object used to append single arguments to the current command
* string. The @check_arg function, if present, will be used to check
* the sanity of the current arg string (which is directly set by the
* caller). After the arg string is successfully appended to the
* string. After the arg string is successfully appended to the
* command string, the optional @separator is appended. If no
* separator was specified when initializing the arg, a space will be
* appended.
*/
void dynevent_arg_init(struct dynevent_arg *arg,
dynevent_check_arg_fn_t check_arg,
char separator)
{
memset(arg, '\0', sizeof(*arg));
@ -406,14 +408,11 @@ void dynevent_arg_init(struct dynevent_arg *arg,
if (!separator)
separator = ' ';
arg->separator = separator;
arg->check_arg = check_arg;
}
/**
* dynevent_arg_pair_init - Initialize a dynevent_arg_pair object
* @arg_pair: A pointer to the dynevent_arg_pair struct representing the arg
* @check_arg: An (optional) pointer to a function checking arg sanity
* @operator: An (optional) operator, appended after adding the first arg
* @separator: An (optional) separator, appended after adding the second arg
*
@ -422,16 +421,13 @@ void dynevent_arg_init(struct dynevent_arg *arg,
* variable_name;' or 'x+y' to the current command string. An
* argument pair consists of a left-hand-side argument and a
* right-hand-side argument separated by an operator, which can be
* whitespace, all followed by a separator, if applicable. The
* @check_arg function, if present, will be used to check the sanity
* of the current arg strings (which is directly set by the caller).
* After the first arg string is successfully appended to the command
* string, the optional @operator is appended, followed by the second
* arg and and optional @separator. If no separator was specified
* when initializing the arg, a space will be appended.
* whitespace, all followed by a separator, if applicable. After the
* first arg string is successfully appended to the command string,
* the optional @operator is appended, followed by the second arg and
* and optional @separator. If no separator was specified when
* initializing the arg, a space will be appended.
*/
void dynevent_arg_pair_init(struct dynevent_arg_pair *arg_pair,
dynevent_check_arg_fn_t check_arg,
char operator, char separator)
{
memset(arg_pair, '\0', sizeof(*arg_pair));
@ -443,8 +439,6 @@ void dynevent_arg_pair_init(struct dynevent_arg_pair *arg_pair,
if (!separator)
separator = ' ';
arg_pair->separator = separator;
arg_pair->check_arg = check_arg;
}
/**

11
kernel/trace/trace_dynevent.h
View File

@ -126,28 +126,27 @@ typedef int (*dynevent_check_arg_fn_t)(void *data);
struct dynevent_arg {
const char *str;
char separator; /* e.g. ';', ',', or nothing */
dynevent_check_arg_fn_t check_arg;
};
extern void dynevent_arg_init(struct dynevent_arg *arg,
dynevent_check_arg_fn_t check_arg,
char separator);
extern int dynevent_arg_add(struct dynevent_cmd *cmd,
struct dynevent_arg *arg);
struct dynevent_arg *arg,
dynevent_check_arg_fn_t check_arg);
struct dynevent_arg_pair {
const char *lhs;
const char *rhs;
char operator; /* e.g. '=' or nothing */
char separator; /* e.g. ';', ',', or nothing */
dynevent_check_arg_fn_t check_arg;
};
extern void dynevent_arg_pair_init(struct dynevent_arg_pair *arg_pair,
dynevent_check_arg_fn_t check_arg,
char operator, char separator);
extern int dynevent_arg_pair_add(struct dynevent_cmd *cmd,
struct dynevent_arg_pair *arg_pair);
struct dynevent_arg_pair *arg_pair,
dynevent_check_arg_fn_t check_arg);
extern int dynevent_str_add(struct dynevent_cmd *cmd, const char *str);
#endif

16
kernel/trace/trace_events_hist.c
View File

@ -1334,12 +1334,12 @@ int synth_event_add_field(struct dynevent_cmd *cmd, const char *type,
if (!type || !name)
return -EINVAL;
dynevent_arg_pair_init(&arg_pair, synth_event_check_arg_fn, 0, ';');
dynevent_arg_pair_init(&arg_pair, 0, ';');
arg_pair.lhs = type;
arg_pair.rhs = name;
ret = dynevent_arg_pair_add(cmd, &arg_pair);
ret = dynevent_arg_pair_add(cmd, &arg_pair, synth_event_check_arg_fn);
if (ret)
return ret;
@ -1377,11 +1377,11 @@ int synth_event_add_field_str(struct dynevent_cmd *cmd, const char *type_name)
if (!type_name)
return -EINVAL;
dynevent_arg_init(&arg, NULL, ';');
dynevent_arg_init(&arg, ';');
arg.str = type_name;
ret = dynevent_arg_add(cmd, &arg);
ret = dynevent_arg_add(cmd, &arg, NULL);
if (ret)
return ret;
@ -1472,9 +1472,9 @@ int __synth_event_gen_cmd_start(struct dynevent_cmd *cmd, const char *name,
if (cmd->type != DYNEVENT_TYPE_SYNTH)
return -EINVAL;
dynevent_arg_init(&arg, NULL, 0);
dynevent_arg_init(&arg, 0);
arg.str = name;
ret = dynevent_arg_add(cmd, &arg);
ret = dynevent_arg_add(cmd, &arg, NULL);
if (ret)
return ret;
@ -1546,9 +1546,9 @@ int synth_event_gen_cmd_array_start(struct dynevent_cmd *cmd, const char *name,
if (n_fields > SYNTH_FIELDS_MAX)
return -EINVAL;
dynevent_arg_init(&arg, NULL, 0);
dynevent_arg_init(&arg, 0);
arg.str = name;
ret = dynevent_arg_add(cmd, &arg);
ret = dynevent_arg_add(cmd, &arg, NULL);
if (ret)
return ret;

10
kernel/trace/trace_kprobe.c
View File

@ -962,9 +962,9 @@ int __kprobe_event_gen_cmd_start(struct dynevent_cmd *cmd, bool kretprobe,
if (ret)
return ret;
dynevent_arg_init(&arg, NULL, 0);
dynevent_arg_init(&arg, 0);
arg.str = loc;
ret = dynevent_arg_add(cmd, &arg);
ret = dynevent_arg_add(cmd, &arg, NULL);
if (ret)
return ret;
@ -982,7 +982,7 @@ int __kprobe_event_gen_cmd_start(struct dynevent_cmd *cmd, bool kretprobe,
}
arg.str = field;
ret = dynevent_arg_add(cmd, &arg);
ret = dynevent_arg_add(cmd, &arg, NULL);
if (ret)
break;
}
@ -1017,7 +1017,7 @@ int __kprobe_event_add_fields(struct dynevent_cmd *cmd, ...)
if (cmd->type != DYNEVENT_TYPE_KPROBE)
return -EINVAL;
dynevent_arg_init(&arg, NULL, 0);
dynevent_arg_init(&arg, 0);
va_start(args, cmd);
for (;;) {
@ -1033,7 +1033,7 @@ int __kprobe_event_add_fields(struct dynevent_cmd *cmd, ...)
}
arg.str = field;
ret = dynevent_arg_add(cmd, &arg);
ret = dynevent_arg_add(cmd, &arg, NULL);
if (ret)
break;
}